Hitachi RAF-25NH4 Service Manual

Hide thumbs Also See for RAF-25NH4:

Service manual (294 pages)

Installation manual (2 pages)

Instruction manual (29 pages)

Table of Contents

Quick Links

Download this manual

SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

RAF-25NH4

RAF-50NH4

RAC-25NH4

RAC-50NH4

SPECIFICATIONS

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

TOTAL AMPERES

COOLING

CAPACITY

TOTAL INPUT

TOTAL AMPERES

HEATING

CAPACITY

DIMENSIONS

(mm)

NET WEIGHT

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

AUGUST 2003

INDOOR UNIT

RAF-25NH4

1 PHASE, 50 Hz, 230V

(W)

695 (155~1,050)

(A)

(kW)

2.50 (0.90 ~ 3.00)

(B.T.U./h)

(W)

1,000 (115 ~ 1,400)

(A)

(kW)

3.90 (0.90 ~ 5.00)

(B.T.U./h)

750

600

215

(kg)

INDOOR UNIT

https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html

Refrigeration & Air-Conditioning Division

RAF-25NH4/RAC-25NH4

RAF-50NH4/RAC-50NH4

REFER TO THE FOUNDATION MANUAL

SPECIFICATIONS ------------------------------------------------------------------- 5

HOW TO USE ------------------------------------------------------------------------ 9

CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------------------- 30

MAIN PARTS COMPONENT --------------------------------------------------- 32

WIRING DIAGRAM ----------------------------------------------------------------- 35

CIRCUIT DIAGRAM ---------------------------------------------------------------- 41

BLOCK DIAGRAM ------------------------------------------------------------------ 45

BASIC MODE ------------------------------------------------------------------------ 47

REFRIGERATING CYCLE DIAGRAM ---------------------------------------- 59

DESCRIPTION OF MAIN CIRCUIT OPERATION ------------------------ 64

SERVICE CALL Q & A ----------------------------------------------------------- 72

DISASSEMBLY AND REASSEMBLY ----------------------------------------- 76

TROUBLE SHOOTING ------------------------------------------------------------ 82

PARTS LIST AND DIAGRAM ------------------------------------------------- 102

DC INVERTER (CONSOLE)

OUTDOOR UNIT

RAC-25NH4

3.05

8,540

4.4

13,300

750

570

280

NO. 0181E

CONTENTS

INDOOR UNIT

OUTDOOR UNIT

RAF-50NH4

RAC-50NH4

1 PHASE, 50 Hz, 230V

1,780 (155~2,200)

7.82

5.00 (0.90 ~ 5.20)

17,070

1,970 (115 ~ 2,100)

8.65

6.70 (0.90 ~ 8.10)

22,200

750

850

600

650

215

298

Table of Contents

Need help?

Do you have a question about the RAF-25NH4 and is the answer not in the manual?

Questions and answers

Summary of Contents for Hitachi RAF-25NH4

Page 1: Table Of Contents
NO. 0181E RAF-25NH4/RAC-25NH4 RAF-50NH4/RAC-50NH4 SERVICE MANUAL REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATIONS ------------------------------------------------------------------- 5 HOW TO USE ------------------------------------------------------------------------ 9 CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------------------- 30 MAIN PARTS COMPONENT --------------------------------------------------- 32 WIRING DIAGRAM ----------------------------------------------------------------- 35...
Page 2: Safety During Repair Work
SAFETY DURING REPAIR WORK 1. In order to disassemble and repair the unit in question, be sure to disconnect the power cord plug from the power outlet before starting the work. 2. If it is necessary to replace any parts, they should be replaced with respective genuine parts for the unit, and the replacement must be effected in correct manner according to the instructions in the Service Manual of the unit.
Page 3 WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS 1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned).
Page 4 (6) Use a three wire type soldering iron including a grounding wire. Metal plate (of aluminium, stainless steel, etc.) Working table Resistor of 1 M (1/2W) Staple Earth wire Bare copper wire (for body earth) Fig. 3. Grounding of the working table Soldering iron Grounding wire...
Page 5 CAUTION In quiet or stopping operation, slight flowing noise of refrigerant in the refrigerating cycle is heard occasionally, but this noise is not abnormal for the operation. When it thunders near by, it is recommend to stop the operation and to disconnect the power cord plug from the power outlet for safety.
Page 6: Specifications
SPECIFICATIONS RAF-25NH4 MODEL RAC-25NH4 RAC-50NH4 RAF-50NH4 FAN MOTOR 20W(DC35V) FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR JU1012D JU1013D COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 3.0A POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR 450NR...
Page 7 MODEL RAF-25NH4, RAF-50NH4 1. Top and Bottom Air Blow System During heating, this air conditioner blows warm air from the bottom as well as from the top outlet as in previous models. When the fan speed is set to "HI" or "AUTO" for cooling, the air conditioner blows cool air from both top and bottom, which allows rapid cooling.
Page 8 2. Damper state in each operation mode • If the Air outlet switch is set to , the damper at the bottom air outlet and air flow from the bottom will be as follows according to the settings of the operation switch and fan speed select buttons: When the set room Operation Fan speed...
Page 9 2. Damper Mechanism (1) Disassembly diagram of damper mechanism Damper limit switch Discharge frame Damper motor (2) Damper operation theory The damper and the link connected to the damper moves at the same time by turning the motor. Damper Drain pan Damper limit switch Damper Damper limit switch is...
Page 10: Safety Precaution
SAFETY PRECAUTION Please read the “Safety Precaution” carefully before operating the unit to ensure correct usage of the unit. Pay special attention to signs of “ Warning” and “ Caution”. The “Warning” section contains matters which, if not observed strictly, may cause death or serious injury. The “Caution” section contains matters which may result in serious consequences if not observed properly.
Page 11 PRECAUTIONS DURING OPERATION The product shall be operated under the manufacturer specification and not for any other intended use. PROHIBITION Do not attempt to operate the unit with wet hands, this could cause fatal accident. DON'T WET When operating the unit with burning equipments, regularly ventilate the STRICTLY OBSERVE room to avoid oxygen insufficiency.
Page 12: Names And Functions Of Each Part
Don't close drain outlet portion in chilly area so as not to freeze these. MODEL NAME AND DIMENSIONS MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm) RAF-25NH4, RAF-50NH4 RAC-25NH4 RAC-50NH4 – 11 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 13 INDOOR UNIT CONTROL PANEL TEMPORARY SWITCH TEMPORARY SWITCH If the remote controller does not work due to battery failure, press this switch to start and stop operation. • This temporary operation will be at the most recent setting made.(The unit will immediately go into automatic operation once power is switched on.) AIR OUTLET SWITCH AIR OUTLET SWITCH...
Page 14: Remote Controller
NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT REMOTE CONTROLLER This controls the operation of the indoor unit. The range of control is about 7 meters. If indoor lighting is controlled electronically, the range of control may be shorter. This unit can be fixed on a wall using the fixture provided. Before fixing it, make sure the indoor unit can be controlled from the remote controller.
Page 15: Various Functions
VARIOUS FUNCTIONS I Auto Restart Control If there is a power failure, operation will be automatically restarted when the power is resumed with previous operation mode and airflow direction. (As the operation is not stopped by remote controller.) If you intend not to continue the operation when the power is resumed, switch off the power supply. When you switch on the circuit breaker, the operation will be automatically restarted with previous operation mode and airflow direction.
Page 16: Heating Operation
HEATING OPERATION Use the device for heating when the outdoor temperature is under 21°C. When it is too warm (over 21°C), the heating function may not work in order to protect the device. In order to keep reliability of the device, please use this device above -15˚C of the outdoor temperature. Press the FUNCTION selector so that the display indicates (HEAT).
Page 17: Dehumidifying Operation
DEHUMIDIFYING OPERATION Use the device for dehumidifying when the room temperature is over 16°C. When it is under 15°C, the dehumidifying function will not work. Press the FUNCTION selector so that the display indicates (DEHUMIDIFY). ˚ The FAN SPEED is set at LOW automatically. The FAN SPEED button does not work.
Page 18: Cooling Operation
COOLING OPERATION Use the device for cooling when the outdoor temperature is 22-42°C. If indoors humidity is very high (80%), some dew may form on the air outlet grille of the indoor unit. Press the FUNCTION selector so that the display indicates (COOL).
Page 19: Fan Operation
FAN OPERATION You can use the device simply as an air circulator. Use this function to dry the interior of the indoor unit at the end of summer. Press the FUNCTION selector so that the display indicates (FAN). Press the (FAN SPEED) button.
Page 20 HOW TO SET THE SLEEP TIMER Set the current time at first if it is not set before (see the pages for setting the current time). Press the (SLEEP) button, and the display changes as shown below. Mode Indication 1 hour 2 hours 3 hours 7 hours...
Page 21: How To Set The Timer
HOW TO SET THE TIMER Time, Day, Month Set the current month and TIME, DAY, day with the TIMER control After you change the MONTH button. batteries; (current time, day, month) OFF TIMER RESET ON TIMER OFF-Timer Press the (OFF-TIMER) button.
Page 22 Set the current time with the Press the (TIME) button again. Press the TIMER control button. The time indication starts lighting (TIME) button. instead of flashing. The time indication will disappear automatically in 10 second. To check the current time setting, press the (TIME) button twice.
Page 23 ADJUSTING THE AIR DEFLECTOR Adjustment of the conditioned air in the upward and downward directions. The horizontal air deflector is automatically set to the proper angle suitable for each operation. The deflector can be swung up and down continuously and also set to the desired angle using the “...
Page 24: Circuit Breaker
HOW TO CHANGE THE BATTERIES IN THE REMOTE CONTROLLER Remove the cover as shown in the figure and remove the old batteries. Push and pull to Install the new batteries. the direction of arrow mark The direction of the batteries should match the marks in the case.
Page 25: Maintenance
MAINTENANCE WARNING • Before cleaning, stop unit operation with the remote controller and turn off the circuit breaker. CAUTION • Do not expose the unit to water as it may cause an electric shock. • For cleaning inside the air conditioner, consult your sales agent. •...
Page 26: Cleaning Of Front Panel
2. HOW TO INSTALL AND REMOVE THE FRONT PANEL • Be sure to use both hands to grasp the front panel when removing it or attaching it. • The front panel may be installed up or down to suit user preference. Removing •...
Page 27: Optional Parts
OPTIONAL PARTS 1. AIR CLEANSING AND DEODORIZING FILTERS (SPX-CFH5) • The air cleansing and deodorizing filters can absorb even minute dust particles. The filter's antibacteria function prevents growth of Air cleansing and deodorizing filters microorganisms in the filter. The air cleansing and deodorozing filters also add air purification to the unit's normal operation to offer a clean and comfortable environment.
Page 28 INFORMATION CAPABILITIES Heating Capability • This room air conditioner utilizes a heat pump system that absorbs CAUTION exterior heat and brings it into a room to be heated. As the amblent temperature gets lower, heating capability will also lower. Do not use a stove In such a situation, the PAM and inverter work to increase or any other high- compressor rpm to keep the unit's heating capability from...
Page 29: Regular Inspection
REGULAR INSPECTION PLEASE CHECK THE FOLLOWING POINTS EITHER EVERY HALF YEARLY OR YEARLY. CONTACT YOUR SALES AGENT SHOULD YOU NEED ANY HELP. Check to see if the unit's earth line has been connected correctly. WARNING If the earth line is disconnected or faulty, unit failure or electric shock hazard may result.
Page 30 Steam emitted from the outdoor unit Water generated during defrosting operation evaporates and steam is emitted. Caused as the smells and particles of smoke, food, cosmetics, etc. present in room air Odors become attached the unit and blown off into the room again. Defrosting is underway (as the heating operation is stopped, the microcomputer checks frost The outdoor unit continues to operate accumulated in the indoor unit and instructs the unit to perform automatic defrosting if nec-...
Page 31: Construction And Dimensional Diagram
CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAF-25NH4, RAF-50NH4 Unit: mm ø65 standard underfloor piping Wireless remote controller hole position Cabinet Front panel Indicator Top air outlet Infrared receiver Small dia pipe (ø6.35) Large dia pipe Air inlet Piping hole Bottom air outlet...
Page 32 CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR OUTDOOR MODEL RAC-25NH4 MODEL RAC-50NH4 Handle Handle Air outlet Air suction grille Holes for anchor bolt (2-ø12) More than More than Fixing hole Service space Notch for anchor bolt (2-ø12 Notchs) – 31 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 33: Main Parts Component
MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications MODEL RAF-25NH4, RAF-50NH4 THERMOSTAT MODEL OPERATION MODE COOL HEAT 15.7 (60.3) 19.0 (66.2) INDICATION 15.0 (59.0) 19.7 (67.5) 23.7 (74.7) 27.0 (80.6) TEMPERATURE INDICATION ˚C (˚F) 23.0 (73.4) 27.7 (81.9) 31.7 (89.1) 35.0 (95.0) INDICATION 31.0 (87.8)
Page 34 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-25NH4 RAC-50NH4 COMPRESSOR MODEL JU1012D JU1013D PHASE SINGLE RATED VOLTAGE AC 220 ~ 230 V RATED FREQUENCY 50 Hz POLE NUMBER WHITE CONNECTION YELLOW 20°C 2M = 1.05 (68°F) RESISTANCE VALUE 75°C 2M = 1.28 (167°F) WHITE YELLOW...
Page 35: Wiring Diagram
WIRING DIAGRAM MODEL RAF-25NH4 / RAC-25NH4 RAF-50NH4 / RAC-50NH4 OUTDOOR UNIT COMPRESSOR CN10 INDOOR UNIT OUTDOOR TEMPERATURE THERMISTOR WHT YEL RED DEFROST BLU : BLUE YEL : YELLOW BRN : BROWN WHT : WHITE THERMISTOR GRY : GRAY ORN : ORANGE...
Page 36 MODEL RAF-25NH4 RAF-50NH4 MODEL RAF-25NH4 RAF-50NH4 REQUIRED REQUIRED REQUIRED REQUIRED LABEL NAME LABEL NAME OF UNIT SIDE OF UNIT SIDE OF UNIT SIDE OF UNIT SIDE 4400 min-1 5100 min-1 400 min-1 400 min-1 WMAX FWUDSS 4500 min-1 5100 min-1...
Page 37: Circuit Diagram
CIRCUIT DIAGRAM Remote Controller (RAR-2P2) SEG15 SEG20 SEG0 SEG19 SEG1 SEG18 SEG2 SEG17 SEG3 SEG16 SEG4 SEG21 SEG5 SEG24 SEG25 SEG6 SEG7 SEG26 SEG27 COM3 SEG28 COM2 LCD 1 COM1 COM0 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG20 SEG21 SEG22 VLC1 SEG23...
Page 38 CIRCUIT DIAGRAM MODEL RAF-25NH4, RAF-50NH4 CN10 XA-6P-TOP (RED) INDOOR UPPER FAN XA-5P-TOP MOTOR CJ102 CJ101 Q131 L101 ICP2 R121 C133 Q111 L111 ICP1 CN15 XA-6P-TOP Q115 R114 Q113 D121 Q112 INDOOR LOWER FAN R115 IC121 MOTOR IC111 TERMINAL BOARD NOTE...
Page 39 CIRCUIT DIAGRAM MODEL RAC-25NH4, RAC-50NH4 – 43 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 40 RAF-25NH4 / RAC-25NH4 RAF-50NH4 / RAC-50NH4 Power source SPM2 1ø, 50Hz, 230V Outdoor unit Terminal board Trip signal synthesis circuit Wireless receive LCD wireless circuit Operation. Room temperature Timer. thermistor Filter. Damper limit switch Stepping motor for Heat exchanger Damper...
Page 41: Basic Mode
BASIC MODE MODEL RAF-25NH4, RAF-50NH4 Operation mode Heating Auto Cooling Dehumidifying Basic operation of start/stop switch Start Stop Start Stop Start/stop switch Operation lamp Start/stop switch Reserve switch Cancel switch Operation lamp Off-timer Timer lamp Timer memory (Off-timer during stop)
Page 42 Table 1 The temperature differences and compressor speed 1 Model : RAF-25NH4 CLMXTP Room temperature- Compressor setting temperature speed (P item) (including shift) 1900min 1.00˚C Cooling set temperature (remote control set 2100min 1.33˚C temperature + SHIFTC) 2600min 1.66˚C 3100min 2.00˚C...
Page 43 Cooling Sleep Operation Cooling Defrost Indoor heat exchange temperature T E I O F 0.5hr Set to 7 hours T E I O N Sleep key Operation lamp Cooling defrost signal Timer lamp See basic operation Indoor fan Sleep 15sec. See basic operation Indoor fan Outdoor fan...
Page 44 Dehumidifying Dehumidifying Sleep Operation Room temperature judgement 0.5 h r 1 h r 2 h r Room temperature Set to 2 hours Sleep key Dehumidifying Operation lamp preset [SLEEP] on the remote temperature controller is lit Timer lamp Indoor fan See basic operation Fan speed set to "Lo"...
Page 45 Table 1 The temperature differences Heating Basic Operation and compressor speed 1 Model: RAF-25NH4 Compressor Setting temperature speed (P item) (including shift) - Heating set temperature (remote control set Room temperature temperature + SHIFTW) 1900min 1.00˚C 2100min 1.33˚C 18˚C 2600min 1.66˚C...
Page 46 Reversing Valve Defrosting Heating Sleep Operation 0.5hr 6.5hr Set to 7 hours Sleep key Operation lamp [SLEEP] on the remote controller is lit Timer lamp Indoor fan Silent See basic Sleep operation See basic operation Outdoor fan TDF 431 Facing up Vertical air 413 TDF421 1 min...
Page 47: Refrigerating Cycle Diagram
REFRIGERATING CYCLE DIAGRAM MODEL RAF-25NH4 / RAC-25NH4 – 59 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 48 REFRIGERATING CYCLE DIAGRAM MODEL RAF-50NH4 / RAC-50NH4 – 60 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 49 Damper control 1. Precondition The damper has 2-directional output and realizes OPEN/CLOSE using a stepping motor. Damper control functions only when the Air outlet SW is set to “ ”. 2. OPEN/CLOSE Operation (1) OPEN operation Start up the damper towards OPEN direction by overall angle width [DNPALD1]. When the start up completes, turn off the output. (2) CLOSE operation Start up the damper towards CLOSE direction by overall angle width [DNPALD1]+tightening angle [CNPPLS1].
Page 50 Thermo intermittence Main Power Remote controller operation Operation starts Thermo OFF Thermo ON Stop Normal operation Thermo OFF Normal operation Operating condition Operation lamp 10sec. Upper fan Setting fan speed Lo Ultra-Lo Setting fan speed 10sec. Lower fan Setting fan speed Setting fan speed Compressor Limit SW...
Page 51 Cooling mode The damper opens at cool dash (excluding smell prevention) and closes at the completion of cool dash. The damper also closes at the moment the Air outlet SW is set to " ". Dash operation (no smell prevention) Main Power Remote controller operation Operation starts Dash operation starts...
Page 52: Description Of Main Circuit Operation
DESCRIPTION OF MAIN CIRCUIT OPERATION Model RAF-25NH4, RAF-50NH4 1. Power Circuit DC/DC FAN-MOTOR CONVERTER POWER-SUPPLY CONTROL CIRCUIT 1CP2 CN10 CJ101 INDOOR UPPER FAN MOTOR R121 Q111 CJ102 1CP1 L111 Q131 R114 Q115 Q113 D121 C133 Q112 IC121 CN15 R115 XA-5P-TOP...
Page 53 2. Reset Circuit 7 Reset Microcomputer R522 IC521 Fig. 2-1 Timing chart Voltage 5.0V 2 pin of IC521 supply voltage RES cancelling voltage RES detecting voltage 4.4V 4.2V Voltage 1 pin of IC521 output voltage 5.0V or 7 pin of microcomputer Fig.
Page 54 3. Room Temperature Thermistor Circuit A room temperature thermistor circuit is shown in Fig. 3-1. According to room temperature, the voltage of point A becomes as it is shown in Fig. 3-2. Room Temperature Micro computer Thermistor R305 Room temperature input R301 C302 Fig.
Page 55 6. Fan Motor Drive Circuit CN10 35V line Microcomputer 5V line No. of Fan Motor R751 rotation output C751 No. of R631 rotation detect C631 Fig. 6-1 The voltage of point A wave form T1 = Low no of rotation T2 = High no of rotation At T2 At T1...
Page 56 2. Indoor/Outdoor Interface Circuit The interface circuit superimposes an interface signal on the DC 35V line supplied from the outdoor unit to perform communications between indoor and outdoor units. This circuit consists of a transmiting circuit which superimposes an interface signal transmit from the microcomputer on the DC 35V line and a transmiting circuit which detects the interface signal on the DC 35V line and outputs it to the microcomputer.
Page 57 Fig. 2-1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other. R805 R813 R803 IC801 L801 R812 R810 IF transmit Q803 Q802 output (SDO) R804 R811 R806 C803 C802 C801 C804 MICROCOMPUTER Q801 R824 R826 R822...
Page 58 0.7V Outdoor HIC Indoor microcomputer DC 35V line 100ms. 33ms. Leader 1 frame Fig. 2-2 Voltages Waveforms of indoor / Outdoor Microcomputers (Outdoor to Indoor Communications) Outdoor HIC Indoor microcomputer DC 35V line 4.95ms. 33ms. Transmit / receive 1 frame switching time Fig.
Page 59 Compressor minimum rotation speed (4 MSB) Compressor minimum rotation speed (3) Compressor minimum rotation speed (2) Compressor minimum rotation speed (1) Compressor minimum rotation speed (0 LSB) Fan-7-step request OVL up 15/20(A) Actual compressor rotation speed (5 MSB) Compressor command speed (7 MSB) Actual compressor rotation speed (4) Compressor command speed (6) Actual compressor rotation speed (3)
Page 60: Service Call Q & A
SERVICE CALL Q & A Model RAF-25NH4 / RAC-25NH4 RAF-50NH4 / RAC-50NH4 COOLING MODE The compressor has Check if the indoor heat If the air conditioner operates stopped suddenly during exchanger is frosted. in cooling mode when it is cooling operation.
Page 61: Auto Operation
AUTO FRESH DEFROSTING Auto Fresh Defrosting is carried out : the After the ON/OFF button is pressed system checks the outdoor heat exchanger to stop heating, the outdoor unit is and defrosts it as necessary before stopping still working with the OPERATION lamp lighting.
Page 62 AT STARTING OPERATION When only the power switch is To ensure correct opening and closing of the turned on, the damper at the bottom damper, the damper will move when power is air outlet moves even if the START/ turned on or the unit is to be operated in order to check its fully opened and closed positions.
Page 63 Air does not flow immediately after Preliminary operation is performed for one operation is started. minute when the power switch on and heating or dehumidifying is set. The operation lamp blinks during this time for heating. This does not indicate a fault. Mold in the room cannot be inhibited Air conditioner drying operation is to dry the even after performing the air condi-...
Page 64: Disassembly And Reassembly
DISASSEMBLY AND REASSEMBLY MODEL RAF-25NH4, RAF-50NH4 1. AIR FILTER Clean the air filter, as it removes dust inside the room. Be sure to clean the filter once every two weeks so as not to consume electricity unnecessarily. PROCEDURE Open the front panel.
Page 65: Front Cover
3. FRONT COVER Remove the four securing screws of the front cover, and then pull the front cover towards you. When attaching the front cover, insert the front cover tabs into these openings. Securing screw Cabinet Front cover ATTACHING When attaching the front cover, fit the three tabs on the top of the front cover so that they enter the openings on the top frame (insert from a slightly raised position).
Page 66 Top frame Stepping motor Cabinet Securing screw Internal electrical parts ATTACHING When attaching the top frame, align the left and right of the top frame with the inside of the guides on the cabinet, and then push the top frame straight to the back. Note: Check to see that there is no space between the top frame and the cabinet.
Page 67 Cabinet Section B Discharge frame 7. DAMPER MOTOR-DAMPER LIMIT SWITCH Remove the securing screws of the damper limit switch. Remove the two securing screws of the damper motor (stepping motor). Pull out the damper motor and the damper limit switch, and then remove them. Damper limit switch Discharge frame Damper motor...
Page 68 ATTACHING Note - Don't touch the ion generating tip when replacing the electrode. - The ion generating tip must be replaced if it is bent. - Clean the electrode with a toothbrush if dust gathers on the electrode. Even if this happens, be sure not to touch the ion generating tip. 9.
Page 69 (10) Use a minus screwdriver or other such tool to raise the two tabs (see arrows in diagram below) securing the right side of the heat exchanger, then pull out the heat exchanger towards you. (11) Pull the lower section of the fan motor support towards you while raising the two levers (tabs) on the left and right of the upper and lower sides of the fan motor support securing the fan motor, and then remove the fan motor support.
Page 70: Trouble Shooting
TROUBLE SHOOTING Model RAF-25NH4 / RAC-25NH4 RAF-50NH4 / RAC-50NH4 PRECAUTIONS FOR CHECKING System power module 2 Power source DANGER – – – 1. Remember that the Compressor motor 0V line is biased to 155-170V in (0V) reference to the ground level.
Page 71 DISCHARGE PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT Caution Voltage of about 300-330V is charged between both ends of smoothing capacitors During continuity check for each part of circuit in indoor unit electrical parts, disconnect red/gray WARNING lead wire connected from diode stack to system power module (SPM2) to prevent secondary trouble.
Page 72 CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE Model RAF-25NH4 / RAC-25NH4 RAF-50NH4 / RAC-50NH4 Timer lamp Does the timer or filter lamp on the indoor unit See “Troubleshooting when the timer lamp blink? blinks”. Check the outdoor electrical parts.
Page 73 TROUBLE SHOOTING WHEN THE TIMER and FILTER LAMP BLINKS Model RAF-25NH4, RAF-50NH4 When the timer lamp on the display section of the indoor unit blinks, refer to the following table. Lamp blinking mode Main defective ------------------------ Once Reversing valve defective...
Page 74 SELF-DIAGNOSIS LIGHTING MODE MODEL: RAC-25NH4, RAC-50NH4 – 86 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 75 CHECKING INDOOR UNIT ELECTRICAL PARTS 1. Power does not come on (no operation) Check the indoor/outdoor unit Is 220-230V AC being generated Is 35V DC being generated connecting cord, and correct any between terminals L and N on the between terminals C and D on defective section (wrong connection, outdoor unit terminal board? the terminal board?
Page 76 2. Outdoor unit does not operate (but receives remote infrared signal) Terminal Boards P.W.B.(Main) Self diagnosis lamps (LD303, 302, 301) Service switch Negative ion lamp blinks nine times "Comunication circuit self- diagnosis" is does by the operation of the remote controller.
Page 77 3. Indoor fan speed does not change (others are normal) 4. Air deflector does not move (others are normal) 5. All systems stop from several seconds minutes to several after operation is started (all indicators are also off) (Set the power switch to "off" to check.) –...
Page 78 6. Check the main P.W.B (power circuit) Check whether the connection cable is disconnected or connected reversely. Check the outdoor unit P.W.B. if it is ok. Replace ICP1. Check whether deflector motor or negative Is ICP1 normal? Less than ion high voltage unit is Is 35V being output to pin5 is normal.
Page 79: Checking The Remote Controller
CHECKING THE REMOTE CONTROLLER – 91 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 80 CHECKING THE OUTDOOR UNIT ELECTRICAL PARTS MODEL RAC-25NH4, RAC-50NH4 – 92 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 81 – 93 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 82 – 94 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 83 – 95 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 84 – 96 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 85: Power Circuit
POWER CIRCUIT Phenomenon 1 <Rotation speed does not increase> Recheck cord, etc. of the Is the DC voltage at least 350V? system power module. If they are disconnected, connect them securely. Is the OVL lamp lit? If the lamp is lit, it does not If abnormality continues, indicate fault, but the unit replace the system...
Page 86 (JUDGING BETWEEN GAS LEAKAGE AND CHECKING THE REFRIGERATING CYCLE COMPRESSOR DEFECTIVE) 1. Troubleshooting procedure (No operation, No heating, No cooling) Lighting mode Blinks Blinks Blinks Blinks Blinks Blinks Connect U,V,W phase leads to the Self- 2 times 3 times 4 times 5 times 6 times 8times...
Page 87 HOW TO CHECK SYSTEM POWER MODULE Checking system power module using tester Set tester to resistance range (X 100) If indicator does not swing in the following conductivity check, the system power module is normal. (In case of digital tester, since built-in battery is set in reverse direction, + and – terminals are reversed.) CAUTION If inner circuit of system power module is disconnected (open), the indicator of tester will not swing and this may assumed as normal.
Page 88: How To Operate The Outdoor Unit Independently
HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT MODEL RAC-25NH4, RAC-50NH4 1. Turn off the power supply to outdoor unit and then turn on again. 2. Remove the electrical box cover. LD303 (red) will light and the unit will operate in the forced cooling mode at this time. Never operate the unit for more than 5 minutes.
Page 89 SYSTEM POWER MODULE DIAGNOSIS Circuit diagram of Collector the device (excepting the reflux diode) BASE Emitter Circuit diagram of the module – Terminals symbol mark of the module See next page for measuring value using tester – L2 L1 – 101 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 90: Parts List And Diagram
PARTS LIST AND DIAGRAM INDOOR UNIT MODEL : RAF-25NH4, RAF-50NH4 – 102 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 91: Parts Name
MODEL RAF-25NH4 PART N0. Q’TY / UNIT PARTS NAME RAF-25NH4 ATI-0972B FAN MOTOR (UPPER) ATI-0972B TANGENTIAL FAN (UPPER) RAS4010LX2 FAN SUPPORT ASSEMBLY ATI-0972B FAN MOTOR (LOWER) ATI-0972B TANGENTIAL FAN (LOWER) ATI-0972B FAN MOTOR SUPPORT (UPPER) RAS-2810NX AUTO SWEEP MOTOR RAF-25NH4...
Page 92 MODEL RAF-25NH4 PART N0. PARTS NAME Q’TY / UNIT RAF-25NH4 ATI-0972B ACCESSORIES ASSEMBLY RAF-25NH4 FRONT PANEL ATI-0972B DAMPER LIMIT SWITCH ATI-0972B BAND (FOR FRONT PANEL) RAP-5CPJ LATCH 1 (FRONT COVER) ATI-0972B AIR FILTER RAF-25NH4 TOP FRAME RAF-25NH4 DISCHARGE GRILL ATI-0972B...
Page 93 HEAT EXCHANGER ASSEMBLY RAS4010KX2 UNION (4) ATI-0972B BULB SUPPORT RAF-50NH4 P.W.B. (MAIN) ATI-0972B P.W.B. (SWITCH) ATI-0972B TERMINAL BORD (2P) RAF-25NH4 CABINET RAF-25NH4 FRONT COVER ASSEMBLY KFR47GBPM DRAIN HOSE RAS-258JX REMOTE CONTROL SUPPORT RAD-25QH4 REMOTE CONTROL ASSEMBLY ATI-0972B FAN MOTOR SUPPORT (LOWER)
Page 94 MODEL RAF-50NH4 PART N0. PARTS NAME Q’TY / UNIT RAF-50NH4 ATI-0972B ACCESSORIES ASSEMBLY RAF-25NH4 FRONT PANEL ATI-0972B DAMPER LIMIT SWITCH ATI-0972B BAND (FOR FRONT PANEL) RAP-5CPJ LATCH 1 (FRONT COVER) ATI-0972B AIR FILTER RAF-25NH4 TOP FRAME RAF-25NH4 DISCHARGE GRILL ATI-0972B...
Page 95 OUTDOOR UNIT MODEL : RAC-25NH4 – 107 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 96 MODEL RAC-25NH4 PART N0. Q’TY / UNIT PARTS NAME RAC-25NH4 PMRAC-25NH4 BASE PMRAC-25NH4 COMPRESSOR KPNT1 PUSH NUT RAC-2226HV COMPRESSOR RUBBER PMRAC-25NH4 CONDENSER PMRAC-25NH4 REVERSING VALVE PMRAC-25NH4 ELECTRICAL EXPANSION COIL PMRAC-25NH4 VALVE (2S) PMRAC-25NH4 VALVE (4S) PMRAC-40CNH2 THERMISTOR (OH) PMRAC-25NH4 OVERHEAT THERMISTOR SUPPORT PMRAC-25NH4 OVERLOAD RELAY COVER PMRAC-40CNH2...
Page 97 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAC-50NH4 – 109 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
Page 98 MODEL RAC-50NH4 PART N0. Q’TY / UNIT PARTS NAME RAC-50NH4 PMRAC-50NH4 BASE PMRAC-50NH4 COMPRESSOR KPNT1 PUSH NUT RAC-2226HV COMPRESSOR RUBBER PMRAC-50NH4 CONDENSER PMRAC-25NH4 REVERSING VALVE PMRAC-25NH4 ELECTRICAL EXPANSION COIL PMRAC-50NH4 VALVE (2S) PMRAC-50NH4 VALVE (4S) PMRAC-40CNH2 THERMISTOR (OH) PMRAC-25NH4 OVERHEAT THERMISTOR SUPPORT PMRAC-25NH4 OVERLOAD RELAY COVER PMRAC-40CNH2...
Page 99 HITACHI RAF-25NH4/RAC-25NH4 PM NO. 0181E RAF-50NH4/RAC-50NH4 Printed in Malaysia https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

This manual is also suitable for:

Rac-25nh4 Raf-50nh4 Rac-50nh4

Hitachi RAF-25NH4 Service Manual

Quick Links

Need help?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Hitachi RAF-25NH4

Summary of Contents for Hitachi RAF-25NH4

This manual is also suitable for:

Table of Contents